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© Research
Publication : The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society

Cold Ischemia Score: An mRNA Assay for the Detection of Extended Cold Ischemia in Formalin-Fixed, Paraffin-Embedded Tissue.

Member: Fay Betsou
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society - 01 Mar 2019

Mathieson W, Mommaerts K, Trouet JM, Mathay C, Guan P, Carithers LJ, Rohrer D, Valley DR, Blanski A, Jewell S, Moore HM, Betsou F,

Link to Pubmed [PMID] – 30562131

Link to DOI – 10.1369/0022155418819967

J Histochem Cytochem 2019 Mar; 67(3): 159-168

Although there are thousands of formalin-fixed paraffin-embedded (FFPE) tissue blocks potentially available for scientific research, many are of questionable quality, partly due to unknown preanalytical variables. We analyzed FFPE tissue biospecimens as part of the National Cancer Institute (NCI) Biospecimen Preanalytical Variables program to identify mRNA markers denoting cold ischemic time. The mRNA was extracted from colon, kidney, and ovary cancer FFPE blocks (40 patients, 10-12 hr fixation time) with 1, 2, 3, and 12 hr cold ischemic times, then analyzed using qRT-PCR for 23 genes selected following a literature search. No genes tested could determine short ischemic times (1-3 hr). However, a combination of three unstable genes normalized to a more stable gene could generate a “Cold Ischemia Score” that could distinguish 1 to 3 hr cold ischemia from 12 hr cold ischemia with 62% sensitivity and 84% specificity.